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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '650508fe75ce38a2ad160eaa264f82ddecd7f6d6885ada3e85a9a1872a7aa3c9' 
  AND token = 'D5Me9mtGm5rGdlVyZ6TGVqOLJIHyLNLlyI7KcpnbcVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}